OpenCloudOS-Kernel/arch/riscv/net
Pu Lehui dd642ccb45 riscv, bpf: Implement more atomic operations for RV64
This patch implement more BPF atomic operations for RV64. The newly
added operations are shown below:

  atomic[64]_[fetch_]add
  atomic[64]_[fetch_]and
  atomic[64]_[fetch_]or
  atomic[64]_xchg
  atomic[64]_cmpxchg

Since riscv specification does not provide AMO instruction for CAS
operation, we use lr/sc instruction for cmpxchg operation, and AMO
instructions for the rest ops.

Tests "test_bpf.ko" and "test_progs -t atomic" have passed, as well
as "test_verifier" with no new failure cases.

Signed-off-by: Pu Lehui <pulehui@huawei.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Song Liu <songliubraving@fb.com>
Acked-by: Björn Töpel <bjorn@kernel.org>
Link: https://lore.kernel.org/bpf/20220410101246.232875-1-pulehui@huawei.com
2022-04-11 16:54:54 +02:00
..
Makefile riscv, bpf: Add RV32G eBPF JIT 2020-03-05 16:13:47 +01:00
bpf_jit.h riscv, bpf: Implement more atomic operations for RV64 2022-04-11 16:54:54 +02:00
bpf_jit_comp32.c bpf: Change value of MAX_TAIL_CALL_CNT from 32 to 33 2021-11-16 14:03:15 +01:00
bpf_jit_comp64.c riscv, bpf: Implement more atomic operations for RV64 2022-04-11 16:54:54 +02:00
bpf_jit_core.c Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next 2021-11-01 19:59:46 -07:00